Jeffrey A. Leon - Chicago Commercial Litigator

Jeff tries cases of tremendous complexity, and he has a way of distilling that complexity in a way that permits effective communication with judges and juries. He honed his litigation skills as an associate at some large-scale prestigious law firms in Chicago. Thereafter, Jeff litigated some of the largest ever consumer class action lawsuits, obtaining settlements that have totaled nearly $1 billion. Some of the largest cases Jeff was heavily involved in included the challenge to the merger between Sirius and XM satellite radio, the challenge to Western Union’s uncompleted money transfer practices, litigation over leaking Lennox air conditioner evaporator coils, and fading Azek composite decking.

Attorney Jeffrey A. Leon is a trial lawyer who is experienced trying large cases:

  • Successfully defended ITW Corporation in a $1.3 billion price-fixing class action lawsuit in a nearly three month long jury trial

  • Defended Chicago Bridge & Iron in a three-month bench trial at the Federal Trade Commission against a challenge to its acquisition of Pitt-Des Moines, Inc.;

  • Defended Yukon Fuel in a contested consent decree proceeding and temporary restraining order hearing concerning its merger with its largest competitor, defeating challenges to the merger in both proceedings;

  • Represented Wye Oak Technologies in an extended bench trial against The Republic of Iraq which resulted in a $122 million dollar judgment against Iraq.


Jeff has the advantage of having litigated cases from both the Plaintiff and Defendant perspective. He both prosecutes class actions, and defends companies against class action lawsuits. He has represented individuals with small claims in class actions, and he has also represented some of the largest corporations in the country against antitrust challenges including Ameritech Corporation (now SBC), Bell Atlantic (now Verizon), Abbott Laboratories, and ITW.

Jeff is a litigator first, and he therefore can handle any type of litigation. Jeff has developed deep specialized knowledge in the areas of antitrust, class actions, and international litigation including claims against foreign sovereigns under the Foreign Sovereign Immunities Act. In addition, Jeff has deep experience handling shareholder suits, non-competition clause litigation, breach of contract, trademark infringement litigation and various types of employment disputes.

Jeff is also a meticulous researcher and writer. He regularly is called upon by other lawyers to write appellate briefs and briefs of great complexity. Jeff is also an experience appellate advocate, having argued numerous times before the Seventh Circuit Court of Appeals as well as arguments in the Second and Tenth Circuits.


Jeff is a 1991 summa cum laude graduate of the Indiana University School of Law-Bloomington where he was third in his class, an editor of the Indiana Law Journal, champion of the Sherman Minton Moot court competition and a member of Order of the Coif. Jeff graduated cum laude from the University of Redlands in 1987 with degrees in political science and history. Jeff was a championship debater at Redlands, and was selected as the fifth most outstanding individual speaker at the 1987 National Debate Tournament.

Jeff has written and spoken extensively. He has lectured on antitrust law at the Kellogg School of Business at Northwestern and has guest lectured at Columbia University’s School of Law and at IIT Chicago Kent School of Law. He has published several articles on antitrust law including, for example, Disaggregation of Economist Liability Testimony in Section One Litigation, ABA Section of Antitrust Law Economics Committee Newsletter and The Evidentiary Role of Antitrust Compliance Policies in Section One Civil Litigation, ABA Sherman Act Section One
Committee Newsletter. For five years Jeff was the co-chair of the Class Action Committee of the ABA Section of Litigation during which he helped organize the largest annual class action conference in the country, and in which he participated in moderating panels. Jeff has also spoken during several Strafford CLE webinars and has spoken at several other litigation-oriented conferences.